题解 | #查找兄弟单词#

import java.util.*;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        if(n<1 || n>1000) return;
        String[] arr = new String[n];
        for(int i=0; i<n; i++){
            String s= sc.next();
            if(s.length()<1 || s.length()>10) continue;
            arr[i] = s;
        }
        Arrays.sort(arr); //字典序排序
        String x = sc.next();
        int k = sc.nextInt();
        if(n<1 || k>n) return;

        int count = 0;
        List<String> list = new ArrayList<>();
        for(String word: arr){
            // if(list.contains(word)) continue;
            if(check(x, word)){
                list.add(word);
                count++;
            }
        }

        System.out.println(list.size());
        if(k <= list.size()){
            // Collections.sort(list);
            System.out.println(list.get(k-1)); //下标从0开始
        }
    }

    public static boolean check(String str, String bro){
        if(str.equals(bro)) return false;
        if(str.length() != bro.length()) return false;
        /*for(int i=0; i<str.length(); i++){
            if(!bro.contains(String.valueOf(str.charAt(i)))){
                return false;
            }
        }*/
        char[] s = str.toCharArray();
        char[] b = bro.toCharArray();
        Arrays.sort(s);
        Arrays.sort(b);
        return new String(s).equals(new String(b));
    }
}